Minor formatting fix in 'generate_feature_test_macro_components' (llvm#148889)

Fixes a small annoyance where generated files have a format which does
not agree with the one checked during `code-formatter` in CI.

For example `libcxx-generate-files` updates (among possibly others) the
`*.version.compile.pass.cpp` files. Previously these files contained an
extra newline which would fail the code format check. If you update that
file manually to remove just that extra trailing newline, then
`check-generated-output` will fail due to the file's contents differing
from what's expected.

Contains a number of changes: one actual change to the py script, and
lots of resulting whitespace changes.

My process for this was:
* Update `generate_feature_test_macro_components`: just remove an extra
newline which causes the code-format step to fail
* Run `$NINJA libcxx-generate-files` to rebuild all these
`.version.pass.cpp`'s
* Watch this PR's CI run to ensure things pass (i.e. this didn't break
things worse)

Author: elsteveogrande

libcxx/test/std/language.support/support.limits/support.limits.general/algorithm.version.compile.pass.cpp

@@ -459,4 +459,3 @@
 #endif // TEST_STD_VER > 23
 
 // clang-format on
-

libcxx/test/std/language.support/support.limits/support.limits.general/any.version.compile.pass.cpp

@@ -69,4 +69,3 @@
 #endif // TEST_STD_VER > 23
 
 // clang-format on
-

libcxx/test/std/language.support/support.limits/support.limits.general/array.version.compile.pass.cpp

@@ -171,4 +171,3 @@
 #endif // TEST_STD_VER > 23
 
 // clang-format on
-

libcxx/test/std/language.support/support.limits/support.limits.general/atomic.version.compile.pass.cpp

@@ -420,4 +420,3 @@
 #endif // TEST_STD_VER > 23
 
 // clang-format on
-

libcxx/test/std/language.support/support.limits/support.limits.general/barrier.version.compile.pass.cpp

@@ -86,4 +86,3 @@
 #endif // TEST_STD_VER > 23
 
 // clang-format on
-

libcxx/test/std/language.support/support.limits/support.limits.general/bit.version.compile.pass.cpp

@@ -195,4 +195,3 @@
 #endif // TEST_STD_VER > 23
 
 // clang-format on
-

libcxx/test/std/language.support/support.limits/support.limits.general/bitset.version.compile.pass.cpp

@@ -90,4 +90,3 @@
 #endif // TEST_STD_VER > 23
 
 // clang-format on
-

libcxx/test/std/language.support/support.limits/support.limits.general/charconv.version.compile.pass.cpp

@@ -123,4 +123,3 @@
 #endif // TEST_STD_VER > 23
 
 // clang-format on
-

libcxx/test/std/language.support/support.limits/support.limits.general/chrono.version.compile.pass.cpp

@@ -108,4 +108,3 @@
 #endif // TEST_STD_VER > 23
 
 // clang-format on
-

libcxx/test/std/language.support/support.limits/support.limits.general/cmath.version.compile.pass.cpp

@@ -204,4 +204,3 @@
 #endif // TEST_STD_VER > 23
 
 // clang-format on
-